Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ec704a96027c2ba…

MALICIOUS

PDF

70.8 KB Created: 2021-09-27 08:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: eb6e73ef02cc31624732c1da6a1daeee SHA-1: 0400783cdd52f54646638ad57b4504f05764d588 SHA-256: 8ec704a96027c2ba8bfe868ec1fd8634605057425923d356a28f2d44cc51ebf2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to various domains, likely to obscure the ultimate destination or to distribute payloads from compromised websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests these links are hosted on disposable domains, a common tactic for malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ddshower.com/ckfinder/userfiles/files/45404685145.pdf In PDF document text
    • http://nomayaku.com/userfiles/file/zeguxidobodutap.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/92729192337.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/b225547f09721e1e600630e97c0b58d0/69145634193.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/36809154387.pdfIn PDF document text
    • http://tiyuchangdi.com/upload_files/files/20210904_213246.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/81261752983.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/49310233564.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16131acf28fe83---nokezogotisekedoronuwudu.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/wifetuguzamero.pdfIn PDF document text
    • https://techlan.pl/files/file/16096833529.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/15276977404.pdfIn PDF document text
    • http://euro-ex.com/images/blog/file/wipod.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/jaxuvejopalokirug.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/razubupiwuz.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/xolilonusalit.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///sewugalo.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161400e0fdffa1---60994473101.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210919190330.pdfIn PDF document text
    • http://0575zl.com/userfiles/file/92840258268.pdfIn PDF document text
    • https://hotelgaric.com/upload/datoteke/kisog.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/fexebi.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161502289cd7db---66399416645.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/bozes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=saavn+jio+pro+apkPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB288 10164 bytes
SHA-256: eed7ca9e6a4a123d74d96a2858df5388729ca37a6e05cc6ed77c82bd2e54db79
font_01_sfnt_off0000c959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC959 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e16b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16B 17696 bytes
SHA-256: 9e318e480cbfb9f7826365f92f99e8c4677314adac72a7e1322d96a4cc4671fa

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